A cartridge auto-changer is provided containing a plurality of cartridges therein and adapted to take out any one of the cartridges to thereby effect the recording and/or reproduction of information. The cartridge auto changer includes an information recording-reproducing apparatus for effecting recording and/or reproduction of information on recording mediums contained in the cartridges, a containing shelf for containing the plurality of cartridges therein, and a conveying device for conveying the cartridges between the information recording-reproducing apparatus and the containing shelf. The conveying device includes a feed roller for conveying the cartridges from the conveying device to the information recording-reproducing apparatus, and a push lever for pushing the cartridges into the information recording-reproducing apparatus subsequently to the conveyance of the cartridges by the feed roller.